San Antonio (TX)
December
Weather in San Antonio, Texas for December 2025
Your guide to San Antonio weather in December - trends and predictions
Until now, December 2025 in San Antonio is slightly cooler than the historical average by -1.5 °F.
Expect cooler weather in the next days in San Antonio with the forecast suggesting a temperature of 24.5 °F, lower than the historical average.
In general, the average temperature in San Antonio at the beginning of December is 18.4 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 25.6 °F by the end of December.
San Antonio experiences moderate rainfall in December, with an average of 7 rainy days and a total precipitation of 36.8 mm.
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Temperatures
Rain 🌧️
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24
Dry days
7
Rainy days
0
Snow days
19°/10°
Temperatures
20 km/h
Avg max wind
61 %
Avg humidity
San Antonio Weather December
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Temperatures trend during December in San Antonio
See the weather trend as well as the moving average line
December weather in San Antonio day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Dec. 1 |  Fog | 19° /9° | 0 mm | 4 | |
| Dec. 2 |  Partly cloudy | 19° /8° | 0 mm | 5 | |
| Dec. 3 |  Sunny | 20° /8° | 0 mm | 5 | |
| Dec. 4 |  Cloudy | 18° /10° | 4 mm | 4 | |
| Dec. 5 | Sunny | 17° /9° | 6.2 mm | 4 | |
| Dec. 6 | Sunny | 18° /7° | 0 mm | 4 | |
| Dec. 7 |  Overcast | 18° /8° | 3.8 mm | 4 | |
| Dec. 8 | Fog | 19° /9° | 0 mm | 5 | |
| Dec. 9 | Fog | 23° /9° | 0 mm | 5 | |
| Dec. 10 | Sunny | 19° /6° | 0 mm | 5 | |
| Dec. 11 | Sunny | 18° /4° | 0 mm | 5 | |
| Dec. 12 |  Patchy rain possible | 20° /7° | 0 mm | 5 | |
| Dec. 13 |  Light drizzle | 18° /13° | 2.8 mm | 4 | |
| Dec. 14 | Patchy rain possible | 20° /11° | 0 mm | 4 | |
| Dec. 15 | Patchy rain possible | 18° /12° | 0.2 mm | 4 | |
| Dec. 16 | Sunny | 18° /12° | 9.6 mm | 4 | |
| Dec. 17 | Sunny | 21° /12° | 0 mm | 5 | |
| Dec. 18 | Fog | 21° /12° | 0 mm | 5 | |
| Dec. 19 | Sunny | 20° /8° | 0 mm | 5 | |
| Dec. 20 | Patchy rain possible | 23° /9° | 0 mm | 6 | |
| Dec. 21 | Light rain shower | 20° /10° | 0.4 mm | 4 | |
| Dec. 22 | Partly cloudy | 17° /8° | 1.3 mm | 3 | |
| Dec. 23 | Partly cloudy | 16° /8° | 1.1 mm | 4 | |
| Dec. 24 | Fog | 23° /18° | 0 mm | 0.9 | |
| Dec. 25 | Fog | 27° /17° | 0 mm | 0.7 | |
| Dec. 26 | Partly cloudy | 29° /19° | 0 mm | 0.9 | |
| Dec. 27 | Mist | 29° /19° | 0 mm | 0 | |
| Dec. 28 | Patchy rain possible | 26° /19° | 0 mm | 5 | |
| Dec. 29 | Patchy rain possible | 25° /17° | 0.1 mm | 5 | |
| Dec. 30 | Patchy rain possible | 20° /17° | 0.2 mm | 4 | |
| Dec. 31 | Patchy rain possible | 23° /18° | 0.4 mm | 4 | |
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Important Notice
Our weather forecast for San Antonio in December is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the San Antonio forecast closer to your planned date for the most up-to-date weather information.
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San Antonio in December - FAQ
What are the expected maximum and minimum temperatures in San Antonio during December?
Enjoy moderate daytime temperatures of up to 19° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in San Antonio during December?
In December, San Antonio can expect light to moderate rainfall, totaling 36.8 mm across approximately 7 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in San Antonio during December?
The average wind speed in San Antonio during December is 20 km/h, suggesting breezy to windy conditions, depending on your activities.
December rainfall patterns in San Antonio
Explore the daily rainfall trends and prepare for San Antonios December weather 💧
Typically, San Antonio has 7 rainy days in December with a total of 36.8 mm of rainfall.
UV exposure in San Antonio during December
Stay informed about UV levels for safe outdoor activities throughout the month of December ☀️
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